有CO和CO2的混合气体共18g，通过足量灼热的氧化铜，充分反应后得

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问题问答题

有CO和CO₂的混合气体共18g，通过足量灼热的氧化铜，充分反应后得到CO₂的总质量为22g，求：

（1）混合气体中CO的质量；______

（2）混合气体中CO₂的质量与反应后生成的CO₂质量的质量比______．

答案

通过分析可知，混合气中的一氧化碳会与氧化铜中的氧元素生成二氧化碳，增加的质量就是参加反应的氧元素的质量，

（1）设混合气体中CO的质量为x

CO+2CuO

△

2Cu+CO₂ 增加的质量

28 44 16

x 22-18=4

x=7g，

（2）混合气体中CO₂的质量=18g-7g=11g

生成CO₂的质量=4g+7g=11g（或22g-11g=11g）

CO₂：（CO₂）_生成=11g：11g=1：1．

故答案为：7g，1：1．

单项选择题

In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)

In his book on the (34) , Joe Simpson wrote:

(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affected me as it had in the crevasse at first. I now had a chance to (40) it and struggle against it.

The survival of Yates himself was (41) . That Simpson somehow found a way of (42) out of the crevasse after 12 hours and then crawled and (43) himself six miles back to camp, (44) three days and might without food or drink, would be considered as a heroic fiction. But in fact it was so (45) .

26（）

A.tough

B.good

C.easy

D.new

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填空题

《海底两万里》中人物在印度洋的珠场和（）展开过搏斗，捕鲸手尼德•兰手刃了一条凶恶的巨鲨；他们在红海里追捕过一条濒于绝种的（），它的肉当晚就被端上了餐桌。

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